Photonic MMW Radar System Analog Phase Modulation Bandwidth
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Solution Overview
Problem
Current integrated radar communication systems face limitations in bandwidth and resolution due to the use of electronic devices, which restrict the simultaneous achievement of high-resolution radar sensing and high-throughput communication.
Innovation Solution
An integrated photonics MMW radar communication system based on analog phase modulation, which includes a transmitter with an optical frequency comb module, an electro-optic modulator, and a communication receiver with a frequency mixer, to generate an integrated MMW radar communication signal with a 4-fold expanded bandwidth, enabling high-resolution radar detection and high-speed communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electronic devices are used to generate integrated radar communication signals, then the system can achieve dual functions of radar sensing and communication transmission, but the bandwidth is limited to the magnitude of GHz and radar resolution and communication rate improvement are very limited
Solution Approach 1:
The patent replaces electronic signal generation with a photonic system. An optical frequency comb generator produces multiple optical frequency components that are then processed through electro-optic modulators and phot detectors to generate millimeter-wave radar communication signals. This substitution of electronic mechanisms with photonic mechanisms enables bandwidth expansion beyond GHz limitations while achieving higher radar resolution through the inherent properties of optical frequency combs.
2Reliability
If discrete communication systems and radar systems are used separately, then each system can be optimized independently, but spectrum resources are scarce and hardware space causes serious conflict and competition
Solution Approach 1:
The patent merges radar sensing and communication transmission functions into a single integrated system. The same photonic-generated millimeter-wave signal is used for both radar echolocation and communication data transmission, allowing spectrum sharing and eliminating the need for separate hardware systems. This merging resolves the conflict between discrete systems for spectrum and hardware space while maintaining optimized performance for both functions.
3Adaptability or versatility
If amplitude modulation (AM) and linear frequency modulated (LFM) signal methods are used in photonics-based integrated communication and radar systems, then dual-band dual-function integration is achieved, but spectrum efficiency is low and radar and communication functions mutually restrict each other
Solution Approach 1:
The patent changes the fundamental modulation parameter from amplitude modulation to phase modulation. By using phase modulated signals generated through photonic frequency comb processing, the system achieves higher spectrum efficiency compared to traditional AM and LFM methods. The phase modulation approach allows for more efficient spectral utilization while maintaining the dual radar and communication functions without mutual restriction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves a 4-fold increase in radar resolution and a 12 dB improvement in communication signal-to-noise ratio, while allowing for co-time and co-frequency operation, thereby enhancing the spectrum efficiency and anti-noise capability of the integrated system.
Implementation Method 1
an electro-optic modulator (EOM), an optical shaping filter, an optical power divider, a photoelectric detector
Implementation Method 2
an optical power divider, a photoelectric detector, an electric power amplifier
Data Source
AI summary
An integrated photonics millimeter wave (MMW) radar communication system based on analog phase modulation scheme includes an integrated photonics MMW radar communication signal transmitter, a radar receiver, and a communication receiver. The transmitter includes a radar communication signal analog phase modulation module, an optical frequency comb (OFC) module, an electro-optic modulator (EOM), an optical shaping filter, an optical power divider, a photoelectric detector, an electric power amplifier, and a transmitting antenna that are cascaded sequentially. The radar receiver includes a radar receiving antenna, an electric low-noise amplifier (LNA), an optical phase modulator, an optical bandpass filter (BPF), a low-speed photoelectric detector, an electric low-pass filter, and a low-speed oscilloscope that are cascaded sequentially. In the communication receiver, a communication receiving antenna is sequentially cascaded with an electric LNA, a frequency mixer, and an oscilloscope, and a voltage-controlled oscillator is cascaded with a frequency multiplier and then connected to the frequency mixer.